Improvement in door-alarms



A, NEVLING.

Door-Alarms.

Patented May 1 2,-1874.`

INVENTUB WITNESSES l ATTGBNEYS.

- 4shown in section.

AN UNITED STATES ABRAHAM NnvLiNe, 4or GLEN Horn, rENnsYLvANIA.'

IMPROVEMENT IN DOOR-ALARMS.

Specification forming partof Lettersrlatent No. 150,776, dated May l2, 1874 application filed4 Maren es, 1874.

To all'ufhom it may concern: Y

Be it known that I, ABRAHAM NnvLiNG, o

Glen Hope, in the county of Clearfield and State of Pennsylvania, have invented a new and useful Improvement in Door-Alarms, of which the following is a specification:

Figure 1 is a front view of my improved door-alarm, a portion of the gong being shown in section, and the rest being removed. Fig. 2 is a side view of the same, the gong being 4 Similar letters of reference indicate corresponding parts.

My invention has for its object to furnish an improved door-alarm, which, in additionl to striking a bell when the door is opened, as au ordinary or day alarm, may be set to sound a continuous alarm when the door is opened, `and thus serve as a night-alarm. The inven tion consists in the combination of the bar or arm to be attached to the door, the toothed wheel, the spring 'pawl, the ratchet wheel, the shaft, and its coiled spring with the hammer and the gong; in the combination of the curved arm, the sliding bar, the lever, and the circle of pins with the clock-work and its hammer, and with the device for operating the alarm from. .the door, and its hammer.

A is the base-plate ofthe alarm, which 'is designed to be attached to the doorfcasing. To the upper part of the y base-plate A is attached a small frame, B, consisting of two plates connected by three or more posts. To one of the posts of the frame B is attached one end of a spring, C, which is coiled around, and its other end is attached to, the shaft D, which revolves in bearings in the plates of the frame B. Theouter end of the shaft D projects, and is squared off to receive a key for turning it to wind up the spring G. To the shaft D is rigidly attached a ratchetwheel, Tl, upon the teeth of which takes hold the pawl F, which is pivoted to the gear-Wheel G, and is held forward against the ratchet-l wheel E by a spring, H, also attached to said gear-wheel G. The gear-wheel G runs loosely upon the shaft D, and its teeth mesh into the teeth of the small gearwheel, I, attached to the shaft J, which revolves in bearings in the plates of the frameB, and to which is-also attached a larger gear-wheel, di, the teeth of which act upon the pallet of the verge L, which is attached to a shaft, M, which works in bearings in the plates of the frame B, and to which is also attached the end of the rod N, to the free end of which is attached the hammer O. The rod or arm N is bent into such a position that the hammer' O may strike the gong P as it is vibrated by the movement of the verge L. Q is a lever, which is pivoted to the base-plate A, and its upper end is so formed that when the lever is operated, it may strike against the hammer-rod N, and push the hammer O inward away from the gong P' when it is not desired to have said hammer operate, as, for'instance, in the day-time. The lower end of the lever Q p'rojects down into such a position that it may be conveniently reached and operated, and its movement is limited by two pins, lt, attached to the base-plate A. To the side of the gear- 4wheelltis attached a circle of pins, S, to

strike against the end of the lever T, to holdk partof the bar U is formed. a hole, u1, to receive a pin, WY, attached to the lower part of the base-plate A, to lock the 'said bar in position to hold the forward end of the lever T against the pins S of the gear-wheel K. The lower part of the bar U has a slot, u2, formed in it to receive the curved arm X, attached to the shaft Y, which works in bearings in the lower part of the base-plate A. The middle part of the lower end of the base-plate A is out away to give space for the attachments of thel shaft Y to operate. To the shaft Y is attached an arm,-Z, to the free end of which is attached ahammer, A', to strike against the gong F, and serve as an ordinary or day alarm. The shaft Y is turned forward, to throw the hammer A against the gong P, bythe spring B', which is coiledaround the said shaft Y. One end of the coiled spring B is attached to the shaft Y, and its other end is attached to the base-plate A. The end of the shaft Y toward the door projects, and has a ratchet-wheel, C', placed upon it, upon the teeth of which the engaging end of the pawl D takes hold. The pawl D is pivoted to the side of the toothed wheel E', and is held down upon the teeth of the ratchet-wheel C by a spring, F', also attached to the toothed `wheel E. The toothed Wheel E', when turned in one direction, runs loosely upon the shaft Y, and when turned in the other direction carries the shaft Y with it until stopped by the coiled spring B, which spring, when the toothed wheel E' is released, projects the hamnier A against the gong l), and sounds an alarm. `Gl is a short bar, Whichis designed to be attached to the door in sue'ha position that when the said door is closed, the said bar may strike the teeth. of the Wheel E', and turn it in the direction in which it runs free. As the door is opened, thebar G turns the wheel E in the direction to coil the spring B and dranT hack the hammer A', so that the alarm may he sounded as the bar G' slips from the teeth of the Wheel E. The bar G .may operate upon the upper or lower side of the Wheel E', according as it is applied toa left or right hand door. The gong P is screwed upon a hollow stud, H, attached to the outer plate of the frame B, and into which the squared end ot the shait l) projects. rEhe cavity 'of the hollow stud H should be of such a size as to allow the key for Winding,` upthe spring C to be readily inserted.

For dayy use, when it is not desired to have the continuous alarm operate, the lever Q is adjusted to hold the Ihammer N O away from the gong l), and the sliding bar U is placed upon the pin WY.

For night use, and at other times when it is desired to have the continuous alarm operate, the lever Q is adjusted to release the hammer N 0, 'and the sliding,` bar U is removed from the pin W, and so adjusted that the point of the curved arm X` of the shaft Y may pass through the slot a2 of the said bar U.' When thus arranged, as the Wheel E is turned by l the opening door the arm X will draw the slide U downward, releasing the gear-Wheel K,

and allowing the hammer N O to be Yibratedl the clock-Work and its hammer, and with the device E F D O Bl Y and its hammer Z A.,

substantially as herein shown and described,

' ABRAHAM iNEVLINGV.

Witnesses:

S. C. PATETIN, Isaac HEGKMAN. 

